Just treated an old computer to 4 GB of RAM (max. motherboard could access) and windows 8.1 64 bit version.
I was expecting to see that only 3 GB was usable even though it recognised 4 GB was installed as I had done a bit of research before hand. I checked in Resource Monitor and as expected the system had reserved 1 GB for hardware leaving 3 GB available for normal use.
I open up msconfig and have tried to tick max memory at 4096mb, un-ticking it completely and restarting to find that the system still only uses 3GB.
My particular bios doesn't have an option for a remap and I'm now stumped as to how to make use of all 4 GB of ram.
I have a geforce 8400 GS graphics card which has its own dedicated memory.
fruitbat - after a lot of googling it seems this is a common problem which nearly everyone else has seemed to solve with the MSCONFIG fix. Before I upgraded I had 3GB of RAM of which all of it was available for use. So why when I replace 2 x 1.5GB ram with 2 x 2GB ram does it now allocate 1GB to system use? It doesn't make sense.
On some onboard graphics it is possible to set the amount of RAM it uses in the BIOS but don't make the same mistake I made and set it to zero because then, as fruitbat mentions, it is impossible to use onboard graphics if your GPU fails
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